Improvement in telegraph-poles



J. & J. MoDERMOTT.

Telegraph-Pole.

Patented Sept. 16,1879.-

FIG. I].

FIG.

ilk-- N.PETF.RS. PHOTO LTHO WASHINGTON n c UNITED STATES PATENT OEEIcE.

JOHN MODERMOTT AND JAMES MODERMOTT, OF WASHINGTON, D. (l.

IMPROVEMENT IN TELEGRAPH-POLES.

Specification formingpart of Letters Patent No. 219,644, dated September16, 1879; application tiled July 29, 1879.

the sockets for holding the insulators.

The object of this invention is to provide a cheap, strong, and durabletelegraph-pole and it consists in making said pole of plain tubularwrought or cast iron, having the cross-arm or insulator-supporting barto pass through said tube.

It further consists in the construction of tapering sockets, eitherround or square, in

which the insulator pins' or holders are securely seated and held intheir places.

It further consists in certain devices where by the tapering sockets aresecured to the cross-arm or insulator-supporting bar.

Heretofore in the construction of telegraphpoles of this character theyhave been made tapering in form, and with rings or projections eastthereon, on which the crossbars or insu lator-supporting bars aresupported. They have also been made of iron tubes of large and smalldiameters, the smaller sections fitting intothe larger onestelescopically; but such devices are necessarily expensive in theirconstruction, and impractical on that account.

Referring to the drawings, A designates the iron tube or pole, which maybe either cast or wrought, in diameter from two to four inches 5 but forordinary purposes we prefer to make them of tubes about from two and ahalf to three inches in diameter, and of any con: venient and desiredlength.

The tube is sunk or set into the ground about two feet, and the endwhich enters the ground may be coated with bitumen, both inside and out,by dipping the same into a kettle containing the melted bitumen. Thiseffectually protects the pole where it enters the ground from rust.

In the top of the pole an insulator pin or holder, B, is inserted, andis held in place by the cross-bar or insulatordiolder O, which passesthrough a hole in the lower end of it, and also through a hole, a, inthe tube or pole.

The hole a maybe round or square; but the cross-bar or insulator-holdermust be square in cross-section in its central portion, so as to preventitsturning in the hole a.

The cross-bar or insulator-holderis made square in cross-section at bothof its ends, so as to receive and hold the insulator-sockets firmly in avertical position. The cross-bar 0 may be made from round iron barssquared in erosssection at the points above named; but in practice wemay make them of square iron bars, and by so doing will be able to placeany number of insulators, of the form hereinafter named, by simplysliding them on one after the other and fastening them with wed ge-keys.

The bar 0 is provided at one end with a head, I), the other end having ascrew-thread cut thereon to receive a nut, o.

By this construction the insulator socket and pin (1, or any number ofthem, are placed on the bar 0, and the bar then passed through a hole inthe bottom of the insulator pin or holder B, and through the hole a inthe top of the pole. The insulators, of any desired number, are then puton the other end of the crossbar, and the nut c screwed on. h is a keyfor holding the cross-bar G firmly in position.

D are the sockets for the reception of the insulator-pins, and haveformed therein tapering holes, which may be round or square incross-section, to receive the tapering ends of the insulator-pins,whichare of a cross-section to correspond to the cross-section of thesockets.

The sockets D are provided with an arm or projection, f, in which areformed square holes or perforations c, to receive the cross-bar C, andby which they are held in their proper position. The insulator-pins,which are held in the sockets D, and supported by the crossbars 0, areprovided with holes 9 near their lower ends, through which are inserteddrawbore pins h, which serve to draw the insulators down into the socketD and hold them firmly in place.

E is a short iron bar, which passes through a perforation in the pole,on which a flexible ladder is secured to enable the workmen to ascendthe pole, and serves also as a support to the workmen while attachingthe wires to the insulators, or for repairing purposes.

Having thus fully described our invention, what we claim, and desire tosecure by Letters Patent, is

1. The removable socket herein described, consisting of the two opensockets D and f, carrying the insulator pin or holder as set forth.

2. A telegraph-pole having one or more cross-bars, 0, provided with endand intermediate sockets, D and f, as set forth.

3. A telegraph-pole having a cross-bar, 0, provided with a head, b, andscrew and nut c, in combination with one or more removable sockets, Dand f, as shown and described.

JOHN MODERMOTT. JAMES lVIoDERMOTT. Witnesses:

D. P. GowL, L. BACON.

